PostgreSQL Selecting The Closest Previous Month of June - postgresql

Question

I am trying to write a piece for a query that grabs the closest, past June 1st. For example, today is 10/2/2018. If I run the query today, I need it to use the date 6/1/2018. If I run it on 5/29/2019, it still needs to grab 6/1/2018. If I run it on 6/2/2019, it should then grab 6/1/2019. If I run it on 6/2/2022, it should then grab 6/1/2022 and so on.
I believe I need to start with something like this:
SELECT CASE WHEN EXTRACT(MONTH FROM NOW())>=6 THEN 'CURRENT' ELSE 'RF LAST' END AS X
--If month is greater than or equal to 6, you are in the CURRENT YEAR (7/1/CURRENT YEAR)
--If month is less than 6, then reference back to the last year (YEAR MINUS ONE)
And I believe I need to truncate the date then perform an operation. I am unsure of which approach to take (if I should be adding a year to a timestamp such as '6/1/1900', or if I should try to disassemble the date parts to perform an operation. I keep getting errors in my attempts such as "operator does not exist". Things I have tried include:
SELECT (CURRENT_DATE- (CURRENT_DATE-INTERVAL '7 months'))
--This does not work as it just gives me a count of days.
SELECT (DATE_TRUNC('month',NOW())+TIMESTAMP'1900-01-01 00:00:00')
--Variations of this just don't work and generally error out.

Answer 1

Use a case expression to determine if you need to use the current year, or, the previous year (months 1 to 5)
case when extract(month from current_date) >= 6 then 0 else -1 end
then add that to the year extracted from current_date, e.g. using to_date()
select to_Date('06' || (extract(year from current_date)::int + case when extract(month from current_date) >= 6 then 0 else -1 end)::varchar, 'mmYYYY');
You could also use make_date(year int, month int, day int) in postgres 9.4+
select make_date(extract(year from current_date) + case when extract(month from current_date) >= 6 then 0 else -1 end, 6, 1) ;

Answer 2

If month lower than 6, trunc year and minus 6 months.
Else trunc year and add 6 months.
set datestyle to SQL,MDY;
select
case when (extract( month from (date::date)))<6 then date_trunc('year',date)-'6 month'::interval
else date_trunc('year',date)+'6 months'::interval
end as closest_prev_june,
another_column,
another_column2
from mytable;
But format is default and supposed you have a column that named date.
If you want to do this with now(), change date columns with now()
function.